CONTEXT: My meeting started at 4:00 and I needed to catch the train at 4:30, so there wasn't much time. Luckily, *it* was short, so it worked out.

Multi-choice question: Do "the train" and "it" have the same meaning?
no

CONTEXT: The delivery truck zoomed by the school bus because *it* was going so fast.

Multi-choice question: Do "the school bus" and "it" have the same meaning?
no

CONTEXT: Bill passed the gameboy to John because *his* turn was over.

Multi-choice question: Do "Bill" and "his" have the same meaning?
yes

CONTEXT: I sat there feeling rather like a chappie I'd once read about in a book , who murdered another cove and hid the body under the dining-room table , and then had to be the life and soul of a dinner party, with *it* there all the time.

Multi-choice question: Do "body" and "it" have the same meaning?

yes